Do you mean breeding or propagating? They are a little trick to
breed because they are dioecious, and trees of both sexes are not
always available, furthermore, the species are hard to tell
apart, differing mainly in the male flowers. They are generally
hand pollinated in cultivation. You tie a piece of the male
flower cluster, with about 30 flowers on it to the female clus-
ter. This is done repeatedly, since not all the flowers open at
once.
Propagation can also be done by offshoots, and this is easier.
The sex is the same, and so are all the other characters. The
offshoots are removed when they are 3-6 years old, after things
warm up. Not too many should be taken in any year in order to
avoid hurting the parent plant. Offshoots should be headed back
after removal. The operation is not always successful
--
Trans-Pacific Nursery Rare and Exotic Plants
Email catalog available Timber Press books discounted